Lunar Dust Grain Charging by Electron Impact: Dependence of the Surface Potential on the Grain Size

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F11%3A10108211" target="_blank" >RIV/00216208:11320/11:10108211 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0004-637X/738/1/14" target="_blank" >http://dx.doi.org/10.1088/0004-637X/738/1/14</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0004-637X/738/1/14" target="_blank" >10.1088/0004-637X/738/1/14</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lunar Dust Grain Charging by Electron Impact: Dependence of the Surface Potential on the Grain Size

Popis výsledku v původním jazyce

The secondary electron emission is believed to play an important role for the dust charging at and close to the lunar surface. However, our knowledge of emission properties of the dust results from model calculations and rather rare laboratory investigations. The present paper reports laboratory measurements of the surface potential on Lunar Highlands Type regolith simulants with sizes between 0.3 and 3 mu m in an electron beam with energy below 700 eV. This investigation is focused on a low-energy part, i.e., {= 100 eV. We found that the equilibrium surface potential of this simulant does not depend on the grain size in our ranges of grain dimensions and the beam energies, however, it is a function of the primary electron beam energy. The measurementsare confirmed by the results of the simulation model of the secondary emission from the spherical samples. Finally, we compare our results with those obtained in laboratory experiments as well as those inferred from in situ observations.

Název v anglickém jazyce

Lunar Dust Grain Charging by Electron Impact: Dependence of the Surface Potential on the Grain Size

Popis výsledku anglicky

The secondary electron emission is believed to play an important role for the dust charging at and close to the lunar surface. However, our knowledge of emission properties of the dust results from model calculations and rather rare laboratory investigations. The present paper reports laboratory measurements of the surface potential on Lunar Highlands Type regolith simulants with sizes between 0.3 and 3 mu m in an electron beam with energy below 700 eV. This investigation is focused on a low-energy part, i.e., {= 100 eV. We found that the equilibrium surface potential of this simulant does not depend on the grain size in our ranges of grain dimensions and the beam energies, however, it is a function of the primary electron beam energy. The measurementsare confirmed by the results of the simulation model of the secondary emission from the spherical samples. Finally, we compare our results with those obtained in laboratory experiments as well as those inferred from in situ observations.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

—

Svazek periodika

738

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

14, 1-7

Kód UT WoS článku

000294015500014

EID výsledku v databázi Scopus

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